The invention discloses a steel plate edge R2 convex circular bead edge milling machine, which belongs to the technical field of edge milling machines. The device comprises a working platform, wherein the working platform comprises a main working platform and a feeding working platform; and the feeding working platform is fixed on the bottom surface of the main working platform. The steel plate edge R2 convex circular bead edge milling machine is characterized in that: a cutting device is arranged on the main working platform, and comprises a main motor and a facing cutter; a motor base is arranged on the main working platform; the main motor is arranged on the motor base, is connected with the facing cutter through a connecting shaft, and is used for controlling the rotation of the facing cutter; a blade is arranged on the facing cutter, and contacted with the edge of a steel plate to be processed; a side guide wheel is arranged on the main working platform, and is contacted with the side surface of the steel plate to be processed; and bottom guide wheels are arranged on the central lines of the feeding working platform and the main working platform, and are contacted with the bottom surface of the steel plate to be processed. Due to the adoption of the device, various steel plate edges can be processed into R2 convex circular beads.